使用CC2591作为CC2530的功放

【实例简介】
使用CC2591作为CC2530的功放, CC2591 PA
The absolute maximum ratings and operating conditions listed in the CC2530 datasheet [1] and the CC2591 datasheet [4] must be followed at all times. Stress exceeding one or more of these limiting values may cause permanent damage to any of the devices Note that these characteristics are only valid when using the recommended register settings presented in Section 4.6 and in Chapter 8, and the CC2530 - EM reference design Operating Frequency 240524835MHz Operating Supply Voltage 2036V Operating Temperature -40 C TC=25C, VDD=3.0V, f=2440 MHz if nothing else is stated. All parameters are measured on the CC2530-Cc2591EM reference design [11] with a 50 Q2 load Receive Current Wait for sync, -90 dBm input level Wait for sync, -50 dBm input level 24 mA TXPOWER OXE5 166 mA TXPOWER OXD5 149 mA TXPOWER OXC5 138 mA TXPOWER OXB5 127 mA Transmit current TXPOWER OXA5 115 A TXPOWER = 0X95 100 mA TXPOWER = 0X85 94 A TXPOWE=0×75 mA TXPOWE=0×65 79 A Power Down Current PM2 UA ISTRUMENTS Page 3 of 19 SWRA308A TC=25C, Vdd=3.0V, f= 2440 MHz if nothing else is stated. All parameters are measured on the CC2530-CC2591 EM reference design with a 50 Q2 load Receive Sensitivity HGM 1 %PER, IEEE 802. 15.4[6] requires -85 dBm -988dBm Receive Sensitivity LGM1 PER, IEEE 802. 15.4 [6] requires -85 dBm -90.4 dBm Saturation lEEE 802.15. 4 [6] requires-20 dBm 10 dBm Wanted signal 3 db above the sensitivity level IEEE 802.15.4 modulated interferer at ieee 802.15.4 channels Interferer Rejection +5 MHz from wanted signal, IEEE 802. 15. 4 [6] requires 0 dB dB +10 MHz from wanted signal, IEEE 802. 15. 4 [6] requires 30 dB 49 dB +20 MHz from wanted signal wanted signal at- 82d Bm dB due to in the external lna and the offset in cc2530 the rssi readouts from cc2530 CC2591 is different from rssi offset values for a standalone cc2530 design the offset values are shown in table 4.4 High Gain Mode 79 LoW Gain mode 67 Real rssi Register value-Rssl offset ISTRUMENTS Page 4 of 19 SWRA308A Tc=25C, Vdd=3.0V, f=2440 MHz if nothing else is stated All parameters are measured on the CC2530-CC2591 EM reference design with a 50 Q2 load Radiated measurements are done with the kit antenna Radiated Emission with TXPOWer Oxe5 Conducted 2. RF (FCC restricted band) -462|dBm Conducted 3. RF(FCC restricted band 46.5 dBm Complies with FCC 15.247. See Chapter 7 for more details about regulatory Radiated 2.RF(FCC restricted band) 42.2dBm requirements and compliance IEEE 802.15.4[6]requires max.35%% Measured as defined by IEEE 802.15. 4 6 TXPOWER OxE5. f= EEE 802.15. 4 channels 13 TXPOWER= OXD5. f= EEE 802.15.4 channels TXPOWER= OXC5 f= EEE 802.15.4 channels Max error∨ ector TXPOWER OxB5 f= IEEE 802.15. 4 channels Magnitude(EVM) TXPOWER OxA5. f= IEEE 802.15.4 channels TXPOWER 0X95. f= IEEE 802. 15.4 channels 643333 %%%%%%% TXPOWER= 0x85. f= iEEE 802. 15.4 channels TXPOWER =0x75 f= IEEE 802. 15.4 channels % TXPOWER= 065. f= iEEE 802. 15.4 channels The RF output power of the CC2530- CC2591 EM is controlled by the 7-bit value in the CC2530 TXPOWER register. Table 4.6 shows the typical output power and current consumption for the recommended power settings The results are given for Tc= 25 C, Vdd 3.0V and f= 2440 MHz, and are measured on the cC2530-CC2591 EM reference design with a 50 Q2 load. For recommendations for the remaining CC2530 registers, see Chapter 8 or use the settings given by SmartRF Studio OXE5 20 166 OxD5 19 149 OxC 18 138 OxB5 17 127 OxA5 16 115 0x95 14 100 0x85 13 94 0X75 86 0x65 10 79 Note that the recommended power settings given in Table 4.6 are a subset of all the possible TXPOWER register settings. However, using other settings than those recommended might INSTRUMENTS Page 5 of 19 SWRA308A result in suboptimal performance in areas like current consumption, EVM, and spurious emission Tc=25C, Vdd=3.0V, f=2440 MHz if nothing else is stated All parameters are measured on the CC2530-CC2591EM reference design with a 50 32 load 22 21 -2V 20 19 18 17 16 11121314151617181920212223242526 25 15 10 OxE5 OxC 5 OxA5 0X85 0x65 5 40-30-20-1001020304050607080 ISTRUMENTS Page 6 of 19 SWRA308A 98 Avg 3.6V Ava 3v Avg 2V 110 11121314151617181920212223242526 102 3.6V -106 2V -110 -40-30-20-100 1020304050607080 70 60 40 20 -Wanted signal at: -82 dBm 10 ISTRUMENTS Page 7 of 19 SWRA308A CC2530-CC2591EM High Gain Mode C C2530-CC2591EM Low Gain Mode - CC2530EM 40 000 -100 110 100908070-60-50-40-30-20-100 The IEEE standard 802.15. 4 [8] requires the transmitted spectral power to be less than the limits specified in table 4.7 If-fc>3.5 MHz -20 dB -30 dBm The results below are given for Tc=25 C, Vdd=3.0V and f= 2440 MHz, and are measured on the CC2530-CC259 1EM reference design with a 50 Q load IEEE absolute Channel 18 2432.5 2435 24375 24425 2445 2447.5 ISTRUMENTS Page 8 of 19 SWRA308A Only a few external components are required for the CC2530-CC2591 reference design. A typical application circuit is shown below in Figure 5.1. Note that the application circuit figure does not show how the board layout should be done. The board layout will greatly influence the RF performance of the CC2530-CC2591EM. TI provides a compact CC2530 CC2591 EM reference design that it is highly recommended to follow. The layout, stack-up and schematic for the CC2591 need to be copied exactly to obtain good performance. Note that the reference design also includes bill of materials with manufacturers and part numbers L102 L10 =TI INF inductor VDD 13 cc2530 LA 1 RF P ANT CC2591 RF N FN PA EN(P1 1) i工工 I NA FNP:1 HGM ENPO 7) T:1 Proper power supply decoupling must be used for optimum performance. In Figure 5.1, only the decoupling components for the CC2591 are shown. This is because, in addition to decoupling, the parallel capacitors C11, C101, and C131 together with, L101, L102, TL11 TL101 and TL131 also work as RF loads. These therefore ensure the optimal performance from the CC2591. C161 decouples the AvDD blAs power. The placement and size of the decoupling components, the power supply filtering and the PCB transmission lines are very important to achieve the best performance Details about the importance of copying the CC2530-CC2591EM reference design exactly and potential consequences of changes are explained in chapter 6 The RF input/output of CC2530 is high impedance and differential. The CC2591 includes a balun and a matching network in addition to the PA, LNa and RF switches which makes the interface to the CC2530 seamless. Only a few components between the CC2530 and CC2591 necessary for RF matching For situation with extreme mismatch(VSWR 6: 1 till 12: 1 out-of-band as shown in Figure 6.2) it is recommended to include all the components as shown in Figure 5.1 ISTRUMENTS Page 9 of 19 SWRA308A Note that the PCB transmission lines that connect the two devices also are part of the RF matching. It is therefore important to copy the distance between the devices, the transmission lines and the stack-up of the PCB according to the reference design to ensure optimum performance The network between the CC2591 and the antenna(L111, C112, C111 C113 and L112 matches the CC2591 to a 50 2 load and provides filtering to pass regulatory demands. C111 also works as a dc-block R151 is a bias resistor the bias resistor is used to set an accurate bias current for internal use in the cc2591 The TI reference design contains two antenna options. As default, the Sma connector is connected to the output of CC2591 through a 0 Q2 resistor. This resistor can be soldered off and rotated 90 clockwise in order to connect to the PCB antenna, which is a planar inverted F antenna(PIFA). Note that all testing and characterization has been done using the SMA connector. The PCB antenna has only been functionally tested by establishing a link between two EMs. Please refer to the antenna selection guide [6] and the Inverted F antenna design note [7 for further details on the antenna solutions ISTRUMENTS Page 10 of 19 SWRA308A 【实例截图】
【核心代码】